just imagine what is going to happen if he falls, there isn't any gear in the roof, and the rope is slack, and the ground is close...

On More monkey than funky, you want to have a little slack in the rope, because of the rope drag where the rope turns the roof. Also, the ground isn't as close as it looks in the photo. He won't deck, He'll just take a long swing. The climber is on the easy part of the climb. The crux is after you turn the roof.

IMHO, he doesn't look that streched. However, he looks like he was clipping bolts from two different routes, increasing the rope drag and creating nasty zig-zags in the rope that may be perfect traps for an upside-down fall... well, he may be going to the bolt on the right side of the picture. In that case, disregard my comment.